MSW Motor Technics MSW-ES-1010 Manual De Instrucciones página 50

3.3.3 Getting rid of excess pressure
Before each time the unit is turned off, get rid of excess pressure
accumulated in the air hose. To do this, you need to:
a) Remove the spray nozzle from the gun.
b) Lock the trigger in the spray gun and turn the unit off - set the
ON/OFF switch to the "O" position.
c) Set the valve switch to the "Spraying" position (see the picture
below).